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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213bf82f476aa3578c6b9a1f3e33f3aa55fb68d34cce275b5688dc5777a43d96' 
  AND token = 'zlamvQ2HmYWQ+MtMLdvZI0nGY10eTtvxz1F+oQZOcsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}